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The image is on a silver clad copper sheet which was then sealed inside a wooden case or a frame under glass to protect it. Studio name often takes up the entire back of the card. It is sometimes confused with ambrotypes and daguerreotypes, but is easily distinguishable from them by the fact that a tintype attracts a small magnet.
The two most advertised card colors were primrose pale yellow and pearl rich off-white though light pink, blue, and green can be found. The presence or a U. Each eye looks at a slightly different image, and the fusion of the two images in the mind creates the illusion of depth.
Description - The first step was to make a negative image on a light sensitive paper. Scalloped edges after mid 1880s.